LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2019 >> LS 500 Base, AWD >> Repair and Diagnosis >> General Information >> OEM General Information >> Setup >> When Replacing Or Removing/Installing Parts >> Update Ecu Security Key [10/2023 - ] >> Update Ecu Security Key [10/2023 - ]
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Update Ecu Security Key [10/2023 - ]

  1. UPDATE ECU SECURITY KEY 
    NOTE:
    • It is necessary to log in to the Toyota server to perform an ECU security key update.
    • Users other than Toyota dealers can log in with a guest account issued when an ECU is ordered.
    1. When using the GTS
      1. Enter the following menus: System Select / Health Check.
      2. Check whether "ECU Security Key: Necessary" is displayed in the upper right corner of the GTS screen.
        Fig 1: ECU Security Key
        GTY968724Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a GTS Health Check Screen
        *b "ECU Security Key: Necessary"
      3. If "ECU Security Key: Necessary" is displayed, follow the prompts on the GTS screen to update the ECU security key.
        Fig 2: ECU Security Key: Necessary
        GTY969202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a GTS Health Check Screen
        *b Perform ECU Security Key Update Icon
      4. When the ECU security key update is completed, enter the following menus: System Select / Health Check.
      5. Check that "ECU Security Key: -" is displayed, and clear the RoB.
        Fig 3: ECU Security Key
        GTY968574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a GTS Health Check Screen
        *b "ECU Security Key: -"
        NOTE:

        If "ECU Security Key: Necessary" is displayed in the upper right corner of the GTS screen, perform the ECU security key update again.

    2. When using the GTS+
      1. Enter the following menus: System Select / Health Check.
      2. Check whether "ECU Security Key: Necessary" is displayed in the upper right corner of the GTS+ screen.
        GTY1122939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a GTS+ Health Check Screen
        *b "ECU Security Key: Necessary"
      3. If "ECU Security Key: Necessary" is displayed, follow the prompts on the GTS+ screen to update the ECU security key.
        GTY1126523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a GTS+ Health Check Screen
        *b Perform ECU Security Key Update Icon
      4. When the ECU security key update is completed, enter the following menus: System Select / Health Check.
      5. Check that "ECU Security Key: -" is displayed, and clear the RoB.
        GTY1128300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a GTS+ Health Check Screen
        *b "ECU Security Key: -"
        NOTE:

        If "ECU Security Key: Necessary" is displayed in the upper right corner of the GTS+ screen, perform the ECU security key update again.

scientia non olet · About LEMON Manuals